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arXiv 0911.0930stat.ME
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模型误设的部分校正插补估计

Imputation Estimators Partially Correct for Model Misspecification

Vladimir N. Minin, John D. O'Brien, Arseni Seregin

摘要:

不完全观测的推断问题通常旨在估计未观测量的总体性质。完成这种估计的一个简单方法是在个体水平上估算未观察到的感兴趣的量,然后对估算值取经验平均值。我们表明,这种简单的插补估计可以提供部分保护,防止模型误设定。我们说明插补估计的鲁棒性模型规格上的三个例子:混合模型为基础的聚类,估计基因型频率在人口遗传学,估计马尔可夫进化距离。在最后一个例子中,使用一个代表性的模型误设定,我们证明了在非退化的情况下,插补估计渐近主导插件估计。最后,我们概述了贝叶斯实施的估算为基础的估计。

英文摘要:

Inference problems with incomplete observations often aim at estimating population properties of unobserved quantities. One simple way to accomplish this estimation is to impute the unobserved quantities of interest at the individual level and then take an empirical average of the imputed values. We show that this simple imputation estimator can provide partial protection against model misspecification. We illustrate imputation estimators' robustness to model specification on three examples: mixture model-based clustering, estimation of genotype frequencies in population genetics, and estimation of Markovian evolutionary distances. In the final example, using a representative model misspecification, we demonstrate that in non-degenerate cases, the imputation estimator dominates the plug-in estimate asymptotically. We conclude by outlining a Bayesian implementation of the imputation-based estimation.

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